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I closed down my laptop's screen (fold it ito the keyboard), opened it above after 15 minutes (unfolded it away from the keyboard) and suddenly the display is just very dark (not black).

Think like when your display will just go very darker. Less bright...

Besides that I can use my Ubuntu 16.04 fully regularly... And it was caused even when I changed nothing in the system. It just happened, for some reason.

For now I am searching a way to bring back the default brightness (?). You might know one?

When I go to to brightness & lock all seems fine.

1 Answers1

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For some reason, going to system settings > brightness & lock (which appeared regularly) and drag the brightness limit to 0 and then to 100, fixed it.

enter image description here

It was on the most right corner and I just dragged it to the most left and then brought it back to the right and the natural brightness came back.

I can't explain this beahvior, maybe it's a bug in the current release, maybe not and I missed something.

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    Have a look at posts like http://askubuntu.com/q/774540/68420. You may want to search 'Ubuntu black screen after suspend'. Also, the combination of your Ubuntu kernel version and BIOS versions may also be of interest. I ended up upgrading my BIOS and re-installing 16.10. That solved it for me. – Jack Jan 21 '17 at 20:53